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CentOS4.5 Edit grub.conf

Hi,
I'm a novice Linux user.
I am trying to edit my grub.conf file. I am logged in as root. It says it is a read only file. I have tried to set permission with chmod 777 and also tried through GUI. Using VI it says it's a read only file. Using nano it will not write either. I have two choices on boot up. I want to automatically go to second automatically. First at the moment is CentOS-4 i386 (2.6.9-55.ELsmp) and second is CentOS-4 i386 (2.6.9-55.EL). Any ideas?
Thanks

Yes I tried the su - command. As far as I am aware I am root with full privileges because I need to be for the application that's running. It states that the file is read-only when trying to make change....
Whe I right-click on file in GUI it states that owner is root and can read & write file!